ONET1151L: Serial interface issue

Anthony Hester

Prodigy 10 points

Part Number: ONET1151L
Other Parts Discussed in Thread: ONET1151P, ONET8551T

Unable to get chip to issue an acknowledge signal (drive SDA low). Attached picture of SCK (green) and SDA (yellow).

over 3 years ago

0 Nasser Mohammadi over 3 years ago

TI__Guru* 93670 points

Hi Anthony,

It seems your scope is set on 1V per division. For some reason we are not acknowledging 7-bits default 0001000 address.

1). I am assuming AD0 and AD1 pins are floating?

2). Also host is not driving SDA on 9th clock pulse?

3). Does ONET1151L share I2C interface with another part?

Please send us a copy of the schematic. Or you can send me a friend request along with your schematic.

Regards,Nasser

0 TI-CSC over 3 years ago in reply to Nasser Mohammadi

TI__Genius 12975 points

Hello Nesser,

Good day. Posting on behalf of the customer.

(1) Correct, AD0, and AD1 are not connected.
(2) Correct, not driving SDA during 9th clock pulse.
(3) No. The ONET1151L does not share the I2C interface with another device.

I attached the schematic of the interface circuit.

sn_customerservice_case_7ca42ddb47978d5868ef7a51e36d4387_attachments.zip

Thank you in advance for your support.

Regards,

CSC

0 Nasser Mohammadi over 3 years ago in reply to TI-CSC

TI__Guru* 93670 points

Greetings,

I was hoping to receive customer board schematic. Please send me internal TI email so i can send you obsoleted ONET1151L schematic so customer can review.

Regards,Nasser

0 Anthony Hester over 3 years ago

Prodigy 10 points

Nasser,

I am using the TI ONET SFP+ 10G LR Reference Design With ONET8551T, ONET1151P, and ONET1151L circuit on page 9 of the document.

Anthony

0 Anthony Hester over 3 years ago

Prodigy 10 points

Nasser,

I am using the TI ONET SFP+ 10G LR Reference Design With ONET8551T, ONET1151P, and ONET1151L circuit on page 9 of the document.

Anthony

0 Nasser Mohammadi over 3 years ago in reply to Anthony Hester

TI__Guru* 93670 points

Hi Anthony,

I am assuming you have the actual reference design. Do you also have access to the GUI that came with this design? This reference design is obsoleted and it is not supported. I am wondering if you have run this GUI and there is communication issue between GUI and reference design.

Regards,Nasser

0 Anthony Hester over 3 years ago in reply to Nasser Mohammadi

Prodigy 10 points

Hi Nasser,

The pdf I downloaded from the TI website (see attachment, page 9) contains a diagram of the circuit. I put the circuit on a PCB. I have no idea as to which GUI your refer. Does the circuit specified in the pdf cause the chip to malfunction?

Thank you,

Anthony

TI one1151 Reference Design.pdf

0 Nasser Mohammadi over 3 years ago in reply to Anthony Hester

TI__Guru* 93670 points

Hi Anthony,

There used to be a GUI with this reference design. This GUI used SMBus interface to setup the ONET registers and etc. Looking at the schematic of this reference design, please load R12 and R13 to see if you see a difference? You can try using 5K ohm value Rs.

Regards,Nasser

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ONET1151L: Serial interface issue